Sewing-machine



F. J. T. AND' H. C. BELL.

SEWING MACHINE.

APPLICATION man was. 1915.

Patented June 24, 1919.

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- 5.1. T. AND 1.0. BELL.

SEWING MACHINE.

APPLICATION F'ILED AUG.3. 1915.

Patentd J 11116 24, 1919.

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SEWlNG MAQH|NE'. 7 APPLICATION FILED AUG-3' H5. 1 .v3(. )7,84c2. Patented J 11119 24, 1919.

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FREDERICK JOHN TURNER BELL AND HARDY CECIL BELL, OF ASHTON-UNDER-LYNE, ENGLAND, ASSIGNORS TO TWIN BOBBIN SEWING MACHINE COMPANY LIMITED, 01?

ASHTON-UNDER-LYNE. ENGLAND.

SEWING-MACHINE.

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Specification of Letters Patent. Patented J 11119 24, 19 19.

Application filed August 3, 1915. Serial No. 43,376.

ing machines of that type known as two reel,

a. 6., in which a reel, bobbin, cheese,or the like of thread. is used for the underthread 1n the machine in the form in which it comes from the manufacturer. The particular type of two reel machine to which these improvements relate is that in which the reel of underthread is contained within a rotary shuttle preferably obliquely disposed and rotated through the medium of pins pro- 'ectin from arms or from a disk mounted on a suitable driving shaft.

This invention relates to a form of rotary shuttle and also a carrier for the reel of underthread and tovarious accessories therefor which reduces the size of the loop of the provements hereinafter more fully described.

In the accompanying drawings, Figure 1 shows a combination or the parts,

to which our improvements relate, assembled in side elevation,

Flg. 2 1s a fIOIltQlGVZLtlOll of F1g. 1,

Figs. 3-31 illustrate the parts separately and some modifications of details, and,

Figs. 32-35 the rotary shuttle in various positions during its rotation around the reel carrier.

The rotary shuttle and holder for the carrier of the reel of under-thread, separately shown in front elevation in Fig. 3 and in side elevation in Fig. 4: consists of a trun-,

cated conical, domed or equivalently shaped metallic shell through the opening of which the reel and its carrier can pass lIltO and be contained within the rotary shuttle. The base of the rotary shuttle A is cut away at one part to form a hook A toenter and engage with the loop of the needle thread. In a modified form the rotary shuttle may be suitably notched and adapted to be fitted Witha hook in any suitable manner, for instance as shown in Fig. 5, and which hook can then be renewed as required. Just past the hook the shuttle is provided with an inclined plateor spreader A extending preferably, up to the front edge of the reel carrier. The rotary shuttle may be furnished with a hard steel ring A around its base, Fig. 6, and the race in which it rotates may be fitted with a similar interchangeable steel. ring, if desired. The base, the conical shell andthe guide plate or spreader A oftho rotary shuttle A, may be produced as separate parts and fitted together as shown in Fig. .7, or the base and conical shell maybe made in one part and the guide plate or spreader A. may be attached to the shuttle in such a way as to beeasily detachable, as shown in Fig. 7. A detachable guide plate or spreader for the case A is separately shown in Figs. 22 and 23. i i i The race for the rotary shuttle, s'hown in Fig. 8 in part elevation and in Fig. 9 in side elevation, in the construction shown consists of a ring B which by means of suitable arms B is connected with a hub B through which the driving shaft S passes and which is secured in any suitable manner, for instance by being clamped in a split bearing 0, Figs. 1 and 2. The ring .13 is not at right angles to the hub B but is obliquely disposed to it.

At its highest point and in the rear the ring Bis fitted with a guard plate D inclined toward the back of the machine which prevents the thread of the needle loop flying toward and becoming entangled with the driving pins. The face of the ring B is fitted with a coveror cap of slightly smaller inner diameter than the inner diameter of the ring, which keeps the rotary shuttle in position within the race. A flange on the cover or cap may provided with bayonet slots adapted to engage with ins disposed on the circumference of the ring. Any other suitable means may be employed for securing the cover or cap in position in such a manner as to be rapidly removable by the operator. Preferred means are shown in Figs; 8 to 11 and and 26. Referring to Figs. 8 and 9 the ring B is provided with three projections B on its periphery, the two upper ones of which are undercut. The cover used in conjunction with these projections is shown in Figs. 10 and 11. It consists of a plain ring E which is slipped under the undercut pro jections'B at the top of the ring B and rests on the projection on the bottom. It is secured in this position by a screw Z, Figs. 1

and 2, passing through a recess. E and into a tapped hole in the ring 13. To facilitate the putting in place of the cover E its periphery may be provided with one or more recesses such as E Fig. 10. By putting the cover on so that one of these recesses fits taryv shuttleycan easily be taken out.

over the lower projection B the cover can be put on, the face of the ring B. It isthen pushed. upward under-the overhanging faces of the upper projections B and brought into the proper position by a slight angular movement. By removing this coverthe ro- Referring to Figs. 25 and 26, the ringiE is provided with recesses Z) into which fit the overhanging inner edges 6 of the projecpreferably made intergralwith the arms G The pins Gr are split or bifurcated: whereby a smooth and light engagement of the pins with their holes in therotary shuttle is insured and an almost noiseless drive is obtained as backlash is prevented.

Between the driving pins and the rotary shuttle and rotating with them there may be, arranged a dished or-fiat plate such as H, Figs. 1 1 and 15, which prevents ballooning of the thread.

After the hook of the rotary shuttle has engaged the loop of needle thread the front partof the loop is carried around at the base ofthe hook as shown in Fig. 32. After the hook has described an angle of about 140 the front of the loop starts slipping along the leading edge of the guide plate or spreader A see Fig. 33. At an angle of about 180 the loop is half way off the rotary shuttle guide plate or spreader A, see Fig. 34:, and commences to slip around the face of the reel carrier case. To facilitate this the stationary reel carrier J, Figs. 16 and 17 and Figs. 30 to 33, is provided with an inclined guide plate J or spreader which extends from the front of the reel carrier toward the back and downward to the front where the needle thread loop slips oil the reel carrier. This inclined plate or spreader J on the reel carrier is so arranged that the needle thread loop is thrown on and over it bythe rotating shuttle and its outer part slides along it as it slips off the shuttle. As shown in Fig. 3 1 the front part of the loop is half way off the shuttle guide plate or spreader A and half way on the reel carrier guide plate or spreader J In Fig. 35 the front part slips off both guide plates or spreaders and is pulled up. The back part of the needle thread loop at the same time slides along the rear edge of the recess or notch in the rotary shuttle till it reaches.

the bottom of the recess and is carried. around the back of the rotary shuttle in advance of the front part of the loop, as shown in Figs. 32 to 35 until it slips off the shuttle. The guide plate or spreader J may be detachable from the reel carrier case J. Such a plate or spreader is. shown separately in Figs. 30 and 31.

The reel carrier J is furnished with a central tubular piece K which fits on a pin or holder L in the center of the rotary shuttle, Figs. 3 and 4. To prevent the reel carrier from slipping off the pin or holder a suitable spring catch onthe front of the reel carrier engages a groove L in the pin or holder. The spring catch shown in Fig. 17 consists of a plate L, provided with a hole and urged sidewise by a, spring Z engaging at one end a notch Z in the plate L Fig. 29, so as to obstruct the hole- L in the reel carrier. The tapered head of the pin or holder L when being introduced. into the hole L? displaces the plate L against the resistance of the spring which subsequently forces the plate L back and into the groove L. of the pin or holder when the reel carrier is firmly held within the rotary shuttle against falling out. lVhen it is desired to take the reel carrier out the plate L is. pressed inward against the resistance of its spring until finally the holes in the plate L and the carrier coincide and the reel carrier can easily be .pulled off the pin or holder of the rotary shuttle. Other means may be employed for this purpose and. we make no claim to this device per 86.

To prevent rotation of the reel carrier J a delivery eye or like part M, Fig. 16, may fit into a notch N in the cover or cap E of the race, Figs. 2 and 10.

The tubular piece K of thereel carrier J be joined together at both ends by collars are made fiat to prevent rocking of the reel upon the bows.

The thread T from the reel contained in the reel carrier ispassed through a narrow slit P in the cylindrical casing of the reel carrier J, Fig. 16, into a wider slot P which extends almost from end to end of the reel carrier casing and from there the thread passes to a guide or barb P situated above and at about the middle of the slot P The thread as it is drawn ofl the reel passes from end to end of the slot P according to whether it is drawn off from one end or the other of the reel whereby friction is reduced and unnecessary straining of the thread avoided. The slot P is preferably curved to conform with an are described from the guide or barb P as a center. The length of the free thread between the slot and the guide will thus always remain equal. The guide or barb P may be produced by stamp ing out a tongue from the reel carrier casing and suitably shaping it, or it may consist of a separate piece suitably attached to the inside of the reel carrier casing and projecting through a slot in it.

From the guide or barb P the thread passes through a groove in the reel carrier casing to the front of the reel carrier where it passes under a barb U on the plate V, Fig. 29, covered by the plate V, Figs. 17 and 28, and under the tension regulating spring (.1, Fig. 17, as separately shown in Fig. 27, and thence to the delivery eye or like part M on the plate V. The tension regulating spring may be suitably placed on the part M which would be adapted to receive it. The screw Q for adjusting the tension regulating spring is easily accessible from the front or top of the machine and the tension of the underthread may thus easily be regulated without the necessity of taking out or moving the reel carrier.

The delivery eye or like part M to which the underthread passes may be provided with a straight groove M At its end the eye is provided with a curl M Figs. 18 and 19, which allows the thread to fall easily into the groove but which retains it safely in position.

The groove may describe a spiral path, if desired, and the delivery end may be provided with an overlapping plate or other retaining device than the one described.

The cover or cap of the race of the reel casing may be provided with a semi-circular Or other suitably shaped plate R, separately shown in Figs. 20 and 21 and Figs. 1 and 2,

attached to the cover, which prevents the thread of the needle loop from flying outward and becomingentangled with any part of the mechanism. The plate R can be attached to the cover or cap for the race in any suitable manner, one method being illustrated in the drawings. i

We declare that what we claim is 1. In a sewing machine of the class whereina rotary shuttle is driven by driving pins engaging holes in the shuttle, the combination of a rotary shuttle with a reel carrier mounted within said shuttle, a spreader plate mounted on said rotary shuttle, and a spreader plate mounted on said reel carrier cooperating with said spreader plate on said rotary shuttle for guiding the needle thread loop. a

2. In a sewing machine of the class wherein a rotary shuttle is driven by driving pins engaging holes in the shuttle, the combination of a rotary shuttle with flexible bifurcated driving pins engaging said shuttle, a shaft for said driving pins and a support for said shaft having parts carriedthereby for supporting said shuttle.

3. In a sewing machine of the class wherein a rotary shuttle is driven by driving pins engaging holes in the shuttle, thecombination of a rotary shuttle with flexible bifurcated driving pins engaging 'said shuttle, a drive shaft for said pins, a support for said shaft having a raceway formed therein in which said shuttle is adapted to ride. r

a. In a sewing machine of the class wherein a rotary shuttle is driven by driving pins engaging holes in the shuttle, the combination of a rotary shuttle with a part having a raceway in which said shuttle is revolubly mounted, a drive shaft and pins having fleXible bifurcated ends engaging in the holes in said rotary shuttle.

5. In a sewing machine of the class wherein a rotary shuttle is driven by driving pins engaging holes in the shuttle, the comb-ination of a rotary shuttle with a reel, a casing for said reel, said casing having an arcuate shaped slot therein extending longitudinally across the casing, a delivery eye carried by said casing, a tension device arranged adjacent said delivery eye, and a guide carried by said casing which carries the thread passing through said slot to the tension de vice from whence it is delivered to the eye.

6. In a sewing machine of the class wherein a rotary shuttle is driven by driving pins engaging holes in the shuttle, the combination of a rotary shuttle with a reel carrier within said shuttle said reel carrier having a surrounding casing, and a delivery eye for said thread carried by said reel carrier, said delivery eye being open for a portion of its circumference.

7 In a sewing machine, the combination of a, shuttle having openings and flexible a detachable cover secured to said part for driving means engaging said openings. holding said shuttle in said raceway, and a 10 8.. In a, sewing machine, the combination guard plate for the needle thread loop seof ashnttlexhavlng openlngs and bifurcated cured to sald cover.

driving pins engaging each of said openings. In Witness whereof We have hereunto set 9.. In a; shuttle for sewing machines, the 0111 hands.

combination of a shuttle With a,- part having FREDERICK JOHN TURNER BELL.

a raceway in which said shuttle is mounted, HARDY CECIL BELL.

Copies. of this patentniay be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

